Here is the story. My brother in law recently had the glass on his fireplace (not woodstove) break during use. He was told the glass got too hot because a piece of wood settled against it and continued burning. Also that the glass that was on his fireplace was only good to 400 degrees, to me that's had to swallow. Unless glass used for a fireplace is different than glass on a woodstove. Because we all know how hot woodstoves can get, and I've never heard of someone breaking glass on a woodstove due to heat. Is there something I don't know?